A Landscape-Scale Assessment of Holocene Fire Regime Controls in South-Eastern British Columbia, Canada
Bibliographic record
Abstract
Multiple vegetation and forest fire history records were established by analyzing Holocene-aged lake sediment stratigraphies collected across a vegetation and elevation gradient in southeast British Columbia, Canada.The stratigraphies were dated using radiometric techniques, 210 Pb and 14 C dating, and tephrochronology and were examined to understand the spatial controls of forest fires and how those controls varied in importance throughout the Holocene in response to orbital geometry variations, climatic change, forest composition changes, and fuel abundance within the watersheds.Local conditions have been shown to be important controls of fire activity in the region, but can be overridden by other broad-scale factors such as climate.Aspect was shown to be an important spatial control of fire frequencies at mid elevation Engelmann spruce-subalpine fir forests.At subalpine elevations, fuel abundance within the catchment was important in explaining millennial to centennial scale fire frequencies.When investigating past biomass burning, the analysis of macroscopic charcoal morphologies permits a more nuanced analysis of the temporal variability in fuel sources and taphonomic processes in a watershed.This study contributes to our knowledge of the varying spatial controls at the landscape scale of Holocene forest fires in mountainous southeastern British Columbia, to understand the influence of local and broad-scales controls of biomass burning and to the analysis of sediment-charcoal morphologies.A version of Chapter 3 was accepted to Quaternary Research as Colin J. Courtney Mustaphi and Michael F.J. Pisaric.Holocene climate-fire-vegetation interactions at a subalpine watershed in southeastern British Columbia, Canada.CJCM and MFJP conceived the study; MFJP and CJCM led the field work; CJCM led the data collection and data analysis; and CJCM and MFJP led the writing.Chapter 4 was submitted to the International Journal of Wildland Fire as Colin J. Courtney Mustaphi and Michael F.J. Pisaric.A 7500-year record of climatefire-vegetation interactions at a mountain valley site, southeast British Columbia, Canada.CJCM and MFJP conceived the study; MFJP and CJCM led the field work; CJCM led the data collection and data analysis; and CJCM and MFJP led the writing.Chapter 5 was submitted to Progress in Physical Geography as Colin J. Courtney Mustaphi and Michael F.J. Pisaric.A classification for macroscopic charcoal morphologies found in Holocene lacustrine sediments.CJCM conceived the study; MFJP and CJCM led the field work; CJCM led the data collection and data analysis; and CJCM and MFJP led the writing.Some additional material, mainly from work done alongside Chapters 2-4, was contributed to a multi-author study submitted to Quaternary International titled
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.004 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".